/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for inet_sock
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*
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* Authors: Many, reorganised here by
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* Arnaldo Carvalho de Melo <acme@mandriva.com>
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*/
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#ifndef _INET_SOCK_H
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#define _INET_SOCK_H
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#include <linux/bitops.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/jhash.h>
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#include <linux/netdevice.h>
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#include <net/flow.h>
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#include <net/sock.h>
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#include <net/request_sock.h>
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#include <net/netns/hash.h>
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#include <net/tcp_states.h>
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#include <net/l3mdev.h>
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/** struct ip_options - IP Options
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*
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* @faddr - Saved first hop address
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* @nexthop - Saved nexthop address in LSRR and SSRR
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* @is_strictroute - Strict source route
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* @srr_is_hit - Packet destination addr was our one
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* @is_changed - IP checksum more not valid
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* @rr_needaddr - Need to record addr of outgoing dev
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* @ts_needtime - Need to record timestamp
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* @ts_needaddr - Need to record addr of outgoing dev
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*/
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struct ip_options {
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__be32 faddr;
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__be32 nexthop;
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unsigned char optlen;
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unsigned char srr;
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unsigned char rr;
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unsigned char ts;
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unsigned char is_strictroute:1,
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srr_is_hit:1,
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is_changed:1,
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rr_needaddr:1,
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ts_needtime:1,
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ts_needaddr:1;
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unsigned char router_alert;
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unsigned char cipso;
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unsigned char __pad2;
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unsigned char __data[];
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};
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struct ip_options_rcu {
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struct rcu_head rcu;
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struct ip_options opt;
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};
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struct ip_options_data {
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struct ip_options_rcu opt;
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char data[40];
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};
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struct inet_request_sock {
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struct request_sock req;
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#define ir_loc_addr req.__req_common.skc_rcv_saddr
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#define ir_rmt_addr req.__req_common.skc_daddr
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#define ir_num req.__req_common.skc_num
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#define ir_rmt_port req.__req_common.skc_dport
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#define ir_v6_rmt_addr req.__req_common.skc_v6_daddr
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#define ir_v6_loc_addr req.__req_common.skc_v6_rcv_saddr
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#define ir_iif req.__req_common.skc_bound_dev_if
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#define ir_cookie req.__req_common.skc_cookie
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#define ireq_net req.__req_common.skc_net
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#define ireq_state req.__req_common.skc_state
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#define ireq_family req.__req_common.skc_family
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u16 snd_wscale : 4,
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rcv_wscale : 4,
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tstamp_ok : 1,
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sack_ok : 1,
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wscale_ok : 1,
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ecn_ok : 1,
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acked : 1,
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no_srccheck: 1,
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smc_ok : 1;
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u32 ir_mark;
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union {
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struct ip_options_rcu __rcu *ireq_opt;
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#if IS_ENABLED(CONFIG_IPV6)
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struct {
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struct ipv6_txoptions *ipv6_opt;
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struct sk_buff *pktopts;
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};
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#endif
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};
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};
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static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
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{
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return (struct inet_request_sock *)sk;
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}
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static inline u32 inet_request_mark(const struct sock *sk, struct sk_buff *skb)
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{
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if (!sk->sk_mark &&
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READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_fwmark_accept))
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return skb->mark;
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return sk->sk_mark;
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}
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static inline int inet_request_bound_dev_if(const struct sock *sk,
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struct sk_buff *skb)
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{
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int bound_dev_if = READ_ONCE(sk->sk_bound_dev_if);
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#ifdef CONFIG_NET_L3_MASTER_DEV
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struct net *net = sock_net(sk);
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if (!bound_dev_if && READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
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return l3mdev_master_ifindex_by_index(net, skb->skb_iif);
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#endif
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return bound_dev_if;
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}
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static inline int inet_sk_bound_l3mdev(const struct sock *sk)
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{
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#ifdef CONFIG_NET_L3_MASTER_DEV
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struct net *net = sock_net(sk);
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if (!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept))
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return l3mdev_master_ifindex_by_index(net,
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sk->sk_bound_dev_if);
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#endif
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return 0;
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}
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static inline bool inet_bound_dev_eq(bool l3mdev_accept, int bound_dev_if,
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int dif, int sdif)
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{
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if (!bound_dev_if)
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return !sdif || l3mdev_accept;
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return bound_dev_if == dif || bound_dev_if == sdif;
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}
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static inline bool inet_sk_bound_dev_eq(struct net *net, int bound_dev_if,
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int dif, int sdif)
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{
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#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
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return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_tcp_l3mdev_accept),
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bound_dev_if, dif, sdif);
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#else
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return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
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#endif
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}
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struct inet_cork {
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unsigned int flags;
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__be32 addr;
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struct ip_options *opt;
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unsigned int fragsize;
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int length; /* Total length of all frames */
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struct dst_entry *dst;
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u8 tx_flags;
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__u8 ttl;
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__s16 tos;
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char priority;
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__u16 gso_size;
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u64 transmit_time;
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u32 mark;
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};
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struct inet_cork_full {
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struct inet_cork base;
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struct flowi fl;
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};
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struct ip_mc_socklist;
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struct ipv6_pinfo;
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struct rtable;
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/** struct inet_sock - representation of INET sockets
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*
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* @sk - ancestor class
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* @pinet6 - pointer to IPv6 control block
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* @inet_daddr - Foreign IPv4 addr
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* @inet_rcv_saddr - Bound local IPv4 addr
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* @inet_dport - Destination port
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* @inet_num - Local port
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* @inet_saddr - Sending source
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* @uc_ttl - Unicast TTL
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* @inet_sport - Source port
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* @inet_id - ID counter for DF pkts
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* @tos - TOS
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* @mc_ttl - Multicasting TTL
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* @is_icsk - is this an inet_connection_sock?
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* @uc_index - Unicast outgoing device index
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* @mc_index - Multicast device index
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* @mc_list - Group array
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* @cork - info to build ip hdr on each ip frag while socket is corked
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*/
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struct inet_sock {
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/* sk and pinet6 has to be the first two members of inet_sock */
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struct sock sk;
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#if IS_ENABLED(CONFIG_IPV6)
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struct ipv6_pinfo *pinet6;
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#endif
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/* Socket demultiplex comparisons on incoming packets. */
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#define inet_daddr sk.__sk_common.skc_daddr
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#define inet_rcv_saddr sk.__sk_common.skc_rcv_saddr
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#define inet_dport sk.__sk_common.skc_dport
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#define inet_num sk.__sk_common.skc_num
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__be32 inet_saddr;
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__s16 uc_ttl;
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__u16 cmsg_flags;
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__be16 inet_sport;
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__u16 inet_id;
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struct ip_options_rcu __rcu *inet_opt;
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int rx_dst_ifindex;
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__u8 tos;
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__u8 min_ttl;
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__u8 mc_ttl;
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__u8 pmtudisc;
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__u8 recverr:1,
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is_icsk:1,
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freebind:1,
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hdrincl:1,
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mc_loop:1,
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transparent:1,
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mc_all:1,
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nodefrag:1;
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__u8 bind_address_no_port:1,
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recverr_rfc4884:1,
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defer_connect:1; /* Indicates that fastopen_connect is set
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* and cookie exists so we defer connect
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* until first data frame is written
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*/
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__u8 rcv_tos;
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__u8 convert_csum;
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int uc_index;
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int mc_index;
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__be32 mc_addr;
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struct ip_mc_socklist __rcu *mc_list;
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struct inet_cork_full cork;
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};
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#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
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#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
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/* cmsg flags for inet */
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#define IP_CMSG_PKTINFO BIT(0)
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#define IP_CMSG_TTL BIT(1)
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#define IP_CMSG_TOS BIT(2)
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#define IP_CMSG_RECVOPTS BIT(3)
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#define IP_CMSG_RETOPTS BIT(4)
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#define IP_CMSG_PASSSEC BIT(5)
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#define IP_CMSG_ORIGDSTADDR BIT(6)
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#define IP_CMSG_CHECKSUM BIT(7)
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#define IP_CMSG_RECVFRAGSIZE BIT(8)
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/**
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* sk_to_full_sk - Access to a full socket
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* @sk: pointer to a socket
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*
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* SYNACK messages might be attached to request sockets.
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* Some places want to reach the listener in this case.
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*/
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static inline struct sock *sk_to_full_sk(struct sock *sk)
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{
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#ifdef CONFIG_INET
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if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
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sk = inet_reqsk(sk)->rsk_listener;
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#endif
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return sk;
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}
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/* sk_to_full_sk() variant with a const argument */
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static inline const struct sock *sk_const_to_full_sk(const struct sock *sk)
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{
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#ifdef CONFIG_INET
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if (sk && sk->sk_state == TCP_NEW_SYN_RECV)
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sk = ((const struct request_sock *)sk)->rsk_listener;
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#endif
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return sk;
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}
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static inline struct sock *skb_to_full_sk(const struct sk_buff *skb)
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{
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return sk_to_full_sk(skb->sk);
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}
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static inline struct inet_sock *inet_sk(const struct sock *sk)
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{
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return (struct inet_sock *)sk;
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}
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static inline void __inet_sk_copy_descendant(struct sock *sk_to,
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const struct sock *sk_from,
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const int ancestor_size)
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{
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memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
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sk_from->sk_prot->obj_size - ancestor_size);
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}
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int inet_sk_rebuild_header(struct sock *sk);
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/**
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* inet_sk_state_load - read sk->sk_state for lockless contexts
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* @sk: socket pointer
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*
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* Paired with inet_sk_state_store(). Used in places we don't hold socket lock:
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* tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
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*/
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static inline int inet_sk_state_load(const struct sock *sk)
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{
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/* state change might impact lockless readers. */
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return smp_load_acquire(&sk->sk_state);
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}
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/**
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* inet_sk_state_store - update sk->sk_state
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* @sk: socket pointer
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* @newstate: new state
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*
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* Paired with inet_sk_state_load(). Should be used in contexts where
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* state change might impact lockless readers.
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*/
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void inet_sk_state_store(struct sock *sk, int newstate);
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void inet_sk_set_state(struct sock *sk, int state);
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static inline unsigned int __inet_ehashfn(const __be32 laddr,
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const __u16 lport,
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const __be32 faddr,
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const __be16 fport,
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u32 initval)
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{
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return jhash_3words((__force __u32) laddr,
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(__force __u32) faddr,
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((__u32) lport) << 16 | (__force __u32)fport,
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initval);
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}
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struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
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struct sock *sk_listener,
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bool attach_listener);
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static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
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{
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__u8 flags = 0;
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if (inet_sk(sk)->transparent || inet_sk(sk)->hdrincl)
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flags |= FLOWI_FLAG_ANYSRC;
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return flags;
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}
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static inline void inet_inc_convert_csum(struct sock *sk)
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{
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inet_sk(sk)->convert_csum++;
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}
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static inline void inet_dec_convert_csum(struct sock *sk)
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{
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if (inet_sk(sk)->convert_csum > 0)
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inet_sk(sk)->convert_csum--;
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}
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static inline bool inet_get_convert_csum(struct sock *sk)
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{
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return !!inet_sk(sk)->convert_csum;
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}
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static inline bool inet_can_nonlocal_bind(struct net *net,
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struct inet_sock *inet)
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{
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return READ_ONCE(net->ipv4.sysctl_ip_nonlocal_bind) ||
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inet->freebind || inet->transparent;
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}
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#endif /* _INET_SOCK_H */
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